The MG cell gateway is typically meant as a device that connects to an edge router/firewall providing internet access. So yes, you'd typically have other things involved in a network like a firewalls & switches. For your use case just having a MG & MV should work keeping in mind the MG is a simple NAT router and not a full blown stateful firewall. You'd need to power the MG and MV with something external like PoE injectors. Or you could consider using a MX with integrated cellular like the MX67C, MX68CW, or Z3C.
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